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1
Break open the coconut on the morning of serving, then extract and grate the flesh immediately, so the natural moisture and the clean scent of fresh coconut milk are still fully present in every strand. No refrigerated, frozen, desiccated, or tinned coconut may be substituted. The grated flesh should be visibly wet and smell of fresh coconut milk — this is the only acceptable starting point.
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2
Place the grated coconut, green chillies, ginger, curry leaves, coriander, and salt into a wet grinder, stone grinder (ammikal), or blender, then add water in the smallest possible increments so you control the final consistency rather than chase it. Grind to a paste that is spreadable and dip-able — slightly thicker than hummus — and that coats a spoon without running off. This is where the dish lives or dies: too much water produces a thin, pourable liquid that will not coat idli or dosa, and the fresh coconut character is diluted beyond recovery; a stone grinder preserves a coarser, more distinct coconut flavour, while a blender is the modern shortcut and yields a smoother result.
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3
Transfer the chutney to a bowl and allow it to cool fully if any heat was generated during grinding, so the tadka you pour over it in the next step remains a shock of searing oil rather than simply warm fat stirred into a warm paste. The chutney must be cold before the tadka is applied.
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4
Heat the coconut oil or sesame oil in a small pan over high heat, then add the mustard seeds and wait, because the seeds must pop and crackle audibly before the other aromatics go in — added too early, the seeds turn bitter rather than nutty. When the seeds are popping, add the dried red chillies and curry leaves together and listen for the sharp hiss and blister that tells you the tadka has bloomed.
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5
Pour the hot tadka immediately over the cold chutney so the volatile fragrance of the spiced oil lifts sharply the moment it strikes the cool coconut paste, delivering the contrast of hot, spitting oil against chilled coconut that is the sensory intention of the dish. Serve at once.